Crankpin truing device



Aug. 18, 1936. R. Wl BARKER 2,051,070

CRANKPIN TRUING DEVICE Filed July 16, 1935 2 Sheets-Sheet l ATTORNEY Aug. 18, 1936. R. w. BARKER CRANKPIN TRUING DEVICE Filed July 16, 1955 A 2 Sheets-Sheet 2 Patented Aug. 18, 1936 UNITED s'm'rrsY PATENT OFFICE 8 Claims.

My invention relates to a new and useful crank pin truing device and is particularly adapted for truing the crank pins on relatively large crank shafts of large engines Without the necessity of dismantling such crank shafts, thus eliminating the great expense in time and labor which would be incurred in the dismantling of such crank shafts, my novel truing device being of a portable character and capable of application directly to the crank shaft through any conventional opening in a wall of the crank case.

My invention further relates to a crank pin truing device in which the crank pin engaging member is offset with respect to the supporting.

member of the device in order to facilitate the engagement of the crank pin truing element with the crank pin of the crank shaft while the supporting element of the truing device is secured to the edge of an opening in a wall of the crank case.

My invention still further relates to a truing device of this character which may be operated manually, or which may be power driven at will, and in which means are provided for effecting accurate adjustment of the cutting'knife with respect to the crank pin.

My invention still further relates to a truing device in which the annulus carrying the cutting element is formed of one piece, with an opening therein permitting the insertion of the crank pin to be trued and with means for effecting continuous driving of said annulus as distinguished from a truing device in which the knife carrying annulus is made of two parts which are assembled for the insertion of the crank pin and subsequently assembled about said crank pin.

My invention still further relates to a truing device comprising means for reciprocating the cutter with respect to the work and means for adjusting the driving mechanism of said cutter to compensate for wear.

Other features of novelty and advantage will be more clearly understood from the following specification and the accompanying drawings in which:

Fig. 1 represents a view in elevation of a crank pin truing device embodying my invention, part of the crank pin and the crank case wall to which the device is applied being shown in dotted lines.

Fig. 2 represents asection on line 2-2 of Fig.' 1.

Fig. 3 represents a front elevation of Fig. 1.

Fig. 4 represents a fragmentary end view of the right hand end of Fig. 1, showing details of the Y driving mechanism.

Fig. 5 is an enlarged section on line 5-5 of Fig. 2.

Fig. 6 represents, on an enlarged scale, a view in side elevation of the hand operated driving mechanism shown at the left hand end of Fig. 1. 5

Fig. 7 represents. on an enlarged scale, a fragmentary View in side elevation of the cutter and the mounting thereof.

Fig. 8 represents a section on line 8-8 of Fig. 7.

Fig. 9 represents, on an enlarged scale, a secl0 tion on line 9 9 of Fig. 3 showing details of the driving mechanism.

Fig. 10 represents a detailed section of the Worm drive adjusting mechanism.

Fig. 11 represents a perspective View of a truing 15 device embodying my invention. v

Referring to the drawings in which like reference characters designate like parts and more particularly to Fig. 11, I designates a crank shaft and 2 designates the crank pin, both shown in 20 dotted lines, in a position to be trued by a truing device embodying my invention. The truing device consists generally of the frame 3 on which is mounted the truing head 4, the screw shaft 6 on which the truing head 4 reciprocates, and the 25 driving mechanism which will be described in more detail in connection with the other figures of the drawings. In order to apply the truing device to the crank pin to be trued, in the manner illustrated in Figs. 2, 3, and 11, a plate is removed from the side wall of the crank case 9 and the frame 3 of the truing device is suitably secured in position on the edge of the crank case with the truing head 4 projecting into the crank case and engaging the crank pin 2. In order to facilitate engagement of the head 4 with the crank pin 2, the head 4 is offset from the frame 3 as best seen in Figs. 2 and 11. The truing head 4 is made of two sections I0 and I2 suitably secured together by the bolts I3 and is carried by the housing I4 which slidably engages the frame 3 as at I6. The housing I4 is provided with the threaded nut I8 which engages the threaded shaft or screw 6,

'so that, when the screw 6 is turned, the truing head 4 will reciprocate along the frame 3. In 45 order to permit insertion of the crank 2 into the truing head 4, the truing head is formed of a circumference less than a circle with the segment 20 (shown detached in Fig. 11) adapted to be clamped in position by the bolts I9 to complete the circumferential bearing after the crank pin 2 is in position Within the truing head 4, as best seen in Fig. 2. f

Carried by the truing head 4 is the gear ring '24, whiclr carries the cutter 25 suitably clamped in position by the bolt 26 and plate 21. The gear ring 24 is provided with a rib 29 which engages a corresponding groove 30 in the truing head section I0 and with the annular gear 32 which seats in a groove 34 common to the sections I0 and I2. It will be noted that the gear ring 24 is of a circumference less than a complete circle with an opening formed therein large enough to permit insertion of the crank pin 2 to be trued. In order to achieve continuous driving of the gear ring 24, despitev its.. discontinuous Yor incomplete circumference, I provide the worms 38 and 40, which are disposed at an angle to each other, said angle being big enough to intercept a segment ofthe ring larger than the open segment thereof, so

that, the gear 32 of the ring is atI all times in mesh with atleast one of the worms 38 or 40. In

other words, while the open 'segment of thecutter ring 24 is passing either of the worms 38 o r 4,0, the other of the worms is in engagement with the gear 32,'thus insuringcontinuous'drive ofthe ring 24. VWhile I have shown twov angularly disposed `worms for drivingthegear ring 24, it is :to be understood that la :chain: drive can be used, if desired,` wherebya portionof the drive chain is at all times in mesh Awith a portion ofthe gear 32 on thering 24;Y y c In order to provide for nice adjustment of the cutter with respectto the work,`I have provided the construction best seenin' Figs. 'l and 8, from which it will be seen'that thecutter 2 5vis mounted on the block 4| which in turnis secured to the gear ring 24 by thebolt 42'which is adjustable in the slot 42m. Beneath the blockM is positioned a wedge 44 movable in the chamber 45 and engaged at its opposite ends by the bolts 48,'sothat, by turning the bolts49the wedge 44 will be moved tothe right or' to the left ofgFig. 8, thus raising or lowering'the block' 4I and vhence thecutter 25; This` is to afford particularly accurate adjustment in addition to `and 4inde'pendently'of the'ordinary adjustmentobtainablel by raising or lowering the cutter 25 'with respect to its support.`

The driving mechanism is asfollows; apulley 50 :is rnountedjon jthe stub slfaft` 5|"which b y means of a train of gears (see Fig. 4) transmits power to and rotates thepshafts55'and 58) The shaft 55 vcarries the gear 69 :which meshes with the gear 6| on the shaft 92 whichcar'ries and rotates the worm' 40.' "The shaft 82'also carries the beveled gear"4whi ch meshes with the beve eled gear'65 'on theshaft 68 which in turnrc'arries the worm 38,'soth'at`, by driving `the pulleyv 50 and actuating theshaft 55, the'shafts' 62V and68 willgbefactuatedV to drive theworms38 and 40. If itisdesired to -turn the'machine by hand a crank handle l0, may-'be used in lieu of the'power driven pulley 50. -j The actuationofthe shaft 58 transmits power to the screw shaft E through the worm 'I5 which engages the'gear l@ on the shaft i'nclosedin the casing '|85 *The shaft 'I1 `carries the beveled gears 'I9 and 80;'which in turn are adapted tob mesh with the beveled gearon the screw shaft 6. The manipulation of the-gears 'I9 and 80 with respectv to the beveled gear 90 Apermits the at' tainment of aneutral position in which the screw shaft 6 is unaffected by the'drive mechanism and also serves to effect reversing of theA direction of turning' of the screw shaft 6'.- Thus, if the gear 90 is in engagement with the gear- 19, the screw shaft-r-will turn-in onedirectionand the truing head 4 will move in the corresponding direction with respect to the frame 3, and'viceversaQif the gear 90is in mesh'withthe gear 18:u ISimilarly if .with the gear 90.

neither of the gears 'I9 or 80 engages the gear 90, the device is in neutra position. In order to determine the engagement of the gear 90 with either of the gears 'I8 or I9, I turn the knob 94 to turn the pinion which engages with the rack 9B on the shaft 91 to move the shaft 91 laterally in its bearings 98. This moves the finger 99 engaging the slot |00 in the shaft TI, intermediate the gears 18 and 19, thus moving the shaft laterally to bring either of the gears 'i8 or 19 into meshwiththe gear 90, or to a position in which neither of the gears 78 or I9 is in engagement In order to provide means for locking the parts in any one of the three possible p`ositions;'Ih'ave provided the spring pressed pin |04, which isadapted to engage any one of the notches |05, it being understood that one of the notches corresponds to a neutral position of the screwl shaft E, the second of the notches in the position in which the screw shaft Vf turns in a clockwise direction, and the third of' said-notches corresponds to the position in which the screw shaft turns in counter-clockwisedirection.

In Fig.' 6, I have shown an arrangement for manual driving of Vtheiscrewl shaft 6 which 'consists inthe crank handle ||0 whichturns the beveled gear I, which engages 'the beveled gear I I2 on the screw shaft 6. In order to enable me to position the handle I'I0 at either side of the screw shaft 6, I provide'an auxiliary beveled gear II3 which also meshes 'with the gear I I2 and which can be engagedby thev handleV I I0, if so desired. Y 1

In Fig. 10 I have showndetails of themounting ofthe shaft 69 to permit adjustment of the worm 38 to take upithe play that mayv develop dueto uneven wear of the worms 38 and 40. According to this construction Il provide the tapered bearing- Ill against which abuts the nut I0| engaging a correspondingly threaded portion |02. When it is desired to adjust the worm V38, it ismerely necessaryl to loosen the nut IIlI and pull out the tapered bearing |00v thus releasing the gear 65 from engagement with'the gear 64 andpermitting the turning of the 'shaft 68 to bring an unworn portion of the thread of the worm into Contact with thegear 34 on thering 24,'whereupon the tapered sleeve bearingj |00 is again wedged onto the shaft 68 and the nut |0| istightened'.y

While I have shown and described my crank pin truing device as applied to the truing of the' crank shaft of an engine by removal of a portion of the crank case thereof, and by'mountingyof the truing devicev on thej edge of the lcrank case, ,it is to be understood that my truing device is equally applicable for'the truing lof any large shafts such as line shafts in factories, the propellor shafts in steam ships, etc.

It isto be noted that bymounting Vthe frame3 of the truing device to the side wall of the crank case I am better enabled accurately to center the truing device, since the cra`nk case Yis built solid in a heavy foundation and is accuratelyaligned as distinguished from the mounting of the truing device on a part of the crank shaft to bettrued, due to the fact that the crank shaftA part to which the truing device is connected may not, itself, be true due to displacement, orjwear and tear. In other words, I provide means for securing` the truing device to an external, properly4 aligned, or properly centered, support, which is independent of the crank shaft to be turned or trued,.vvhich is an important feature in arriving at satisfactory and `accurate results.

It is also to be noted that the' particular manner in which the truing-head is offset with regard to the frame thereof, namely, to both the vertical and horizontal planes of said frame, enables the truing-head to be inserted through relatively small openings, or through limited spaces, for complete access to the part of the shaft to be trued. Further, the provision of a gear-ring, which is bigger than one-half but less than a complete circle, gives the effect of a complete or circular gear-ring Without the necessity of the mechanic actually entering the space Where the crank shaft is and building a segmental, or sectional, gear-ring about the shaft, as has been the practice in the prior art, as it is represented in the Polderman Patent No. 1,833,589.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is;

1. A crank pin truing device comprising a frame adapted to be secured to the crank case of the engine, a head reciprocable on said frame, and an arcuately movable cutter carried by said head, said head being offset at an angle with respect to both the vertical and horizontal planes of said frame.

2. A crank pin truing device comprising a frame adapted to be secured to the crank case of the engine, a head reciprocable on said frame, and a cutter carried by said head, said head con stituting an arc larger than half of, but less than a complete circle.

3. A truing device for truing the crank pins of large crank shafts, Without dismantling the latter, comprising a frame adapted to be secured to the edge of the crank case of the engine, an arcuate element revolubly mounted in offset position with respect to both the vertical and horizontal planes of said frame and having an opening for admitting the crank pin to be trued, a cutter carried by said arcuate element, and angularly disposed driving mechanisms, atleast one of which is at all times in contact with said arcuate element for continuously driving the latter.

4. A truing device for truing the crank pins of large crank shafts Without dismantling the latter 5 comprising a frame adapted to be secured to the edge of the crank case of the engine, an integral arcuate element revolubly mounted in offset position with respect to both the vertical and horizontal planes of said frame, and having an open- 10 ing therein adapted to receive the crank pin to be trued, a cutter carried by said arcuate element, and means for continuously driving said arcuate element.

5. A crank pin truing device comprising a 15 frame, a head reciprocable on said frame, and an arcuately movable cutter carried by said head, said head being offset at an angle with respect to both the vertical and horizontal planes of said frame.

6. A crank pin truing device comprising a frame, a head reciprocable on said frame, and a cutter carried by said head, said head constituting an arc larger than half of, but less than a complete circle. 25

7. A shaft truing device comprising a frame, a. head reciprocable on said frame, a gear ring carried by said head, and a cutter carried by said gear ring, said gear ring constituting an arc larger than one-half of but less than a complete 30 circle.

8. A crank pin truing device comprising, a frame adapted to be secured to a support in proximity to the crank pin to be trued, a head reciprocable on said frame, and an arcuately 35 movable cutter carried by said head, said head being offset at an angle with respect to both the Vertical and horizontal planes of said frame.

ROBERT W. BARKER. 40 

